I don't know why you emphasize 3.0 on the pci-express slot; I don't think even an r9 290x or gtx titan would be bottlenecked by a 2.0 slot, let alone a 7000-series gpu. However, I think this board meets your requirements and budget:http://www.theitdepot.com/details-Gigabyte+GA-B75M-D3V+16GB+DDR3+Intel+Motherboard_C13P20382.html
Thank you for giving me the solution
. I actually forgot to search for b75 chipset motherboards last time
. And the models I come up with are ASUS P8B75-M LX and P8B75-M LX Plus . I appreciate your answer but I don't know why, but I like ASUS products than Gigabyte...